>>717207334I don't have a problem with them either, I'm just wondering at what point it's not longer deduction. Some people say it's when you can no longer do it all in your head, but that implies whether something is deducible depends on someone's mental abilities, rather than being a quality of the problem itself. I'm solving the puzzles either way, whatever it's called, but at times you need to follow quite a few mental 'try' steps to exclude a move.